The spacecraft is being developed internally by NASA/GSFC in Greenbelt, Maryland. The usage of common interfaces stresses modularity in the spaceship architecture.
LRO is a nadir-pointing, three-axis stabilised spacecraft that is intended to function constantly throughout the main mission.
The following elements make up the ACS (Attitude Control Subsystem): Honeywell's MIMU consists of 10 CSS (Coarse Sun Sensors), 4 RW (Reaction Wheels), 2 A-STR (Autonomous Star Trackers), and an RLG (Ring Laser Gyroscope) (Miniature Inertial Measurement Unit). Up to 18 o/s and up to 60 rpm, respectively, of attitude rate polarity are provided by MIMU. The response wheels are created expressly to offer very quiet, smooth adjustments in the spacecraft's pointing.
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